-74.88% is the change from 840 to 211
Calculation steps:
[( 211 - 840 ) ÷ 840] x 100 = -74.88%
Formula
Percentage change = [(211 - 840) / 840] x 100
Subtract the new number by the original number
211 - 840 = -629
-629 ÷ 840 = -0.7488095238095238
-0.7488095238095238 x 100 = -74.88%